Candi Pembakaran, maybe a crematorium. Beyond the second row of gates on 3rd terrace, on the north aspect in the plateau there is a composition comparable to The bottom A part of the temple with two terraces about 26x26 m in size. Just like Borobudur, Prambanan also acknowledge the hierarchy https://prambanantemplerestoratio28371.blogerus.com/52779883/prambanan-temple-an-overview